Add new user to site permissions - not resolving user names

We've just installed Sharepoint Services in ourproduction environment after having tested on adifferent server for a few months. Previously, I wasable to add a new user to a site using either theiraccount name or e-mail address (or from Exchangeaddress book), and the rest of the information wouldautomatically populate. This saved us having to enterin Display names, for example.

However in our new environment, this is not occurring.Any ideas on what settings I might check?(Unfortunately I am not the person who did the recentinstall, and the recent install is on a differentserver cluster than the test environment).

I'm not sure if that article isrelevant, as we never did import users in bulk in ourtest environment. The Profile page looks exactly thesame between the two installs. One difference, isthat the newer install is hosted on a server, in aclustered environment, and that cluster may be"talking" to a different node in ActiveDirectory...(this aspect of Sharepoint and serversisn't really my usual area of expertise, sorry I mightnot be explaining this correctly. As mentioned I didnot participate in either insall, just trying to pickup the pieces!)

In either case, I can still give users permissions, soI'm not dead in the water, I just have to manuallyenter in either their domain user account name ortheir e-mail address, and their display name eachtime, where before it was all done automatically.

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